LSC Smart Dimmer Switch teardown

Bacto 8160 12

Helpful post? (+3)

Post #1
20239100 16 Oct 2022 19:48

Hi,

I bought a "LSC Smart Dimmer Switch" from Action in France for around 10€.

It is a wall switch, working on a battery consisting of:

- A WB3S module (WiFi with a BK7231T)
- A Tuya MCU with no reference written
- A rotary switch with an integrated push button
- 2 LEDs:
- One that seems RGB (seems connecter to the TuyaMCU)
- One green (seems to be related to the charge function)
- A power switch
- A reset button
- A 3.7V battery
- A USB C connector use to charge the battery

Here is the circuit:

Work is in progress to make it work with OpenBekenIOT
https://github.com/openshwprojects/OpenBK7231T_App/issues/291#

Best,
Adrien

Cool? Ranking DIY
About Author
Bacto Bacto

Level 3
Offline

Joined: 16 Oct 2022

Posts: 8

Posts rating: 5

Points: 105
Bacto wrote 8 posts with rating 5. Been with us since 2022 year.
ADVERTISEMENT
#2 20239692 17 Oct 2022 08:36

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Helpful post? (+1)

Post #2
20239692 17 Oct 2022 08:36

As said on Github, full packet capture would be nice, both queries and replies.

A full Action item model or index also would be helpful. Anyway, thanks for teardown, it will be added to our online database soon.

BTW: Are all buttons and LEDs connected to TuyaMCU, even the reset button?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#3 20239779 17 Oct 2022 09:43

Bacto Bacto

Level 3

Topic author Helpful post? (0)

Post #3
20239779 17 Oct 2022 09:43

I'm not sure 100% but it seems that the RGB LED and power/reset button are connected to the TuyaMCU while the green LED is connected to the charging circuit.
ADVERTISEMENT
#4 20347053 22 Dec 2022 06:37

HumbleDeer HumbleDeer

Level 4

Helpful post? (0)

Post #4
20347053 22 Dec 2022 06:37

Bacto wrote:
I'm not sure 100% but it seems that the RGB LED and power/reset button are connected to the TuyaMCU while the green LED is connected to the charging circuit.

I can confirm your guess or look-see about the green LED is correct. Green LED with LED1 as designator is connected to the five pin chip labeled "B5UD" of which I can find NO info at all but suspect it to be an LTC4054 (TP4054 in China) clone. The pinout matches, to the details of the CHRG pin being an open collector input, the program pin being used for current setting, and its behaviour with the LED blinking rapidly when the charger is connected without a battery. This is typical textbook LTC4054 behaviour.
ADVERTISEMENT
#5 20372715 07 Jan 2023 13:05

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Helpful post? (+1)

Post #5
20372715 07 Jan 2023 13:05

I am adding missing information to devices list, do anyone know an Action Store article number or any other ID for this device?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#6 20372786 07 Jan 2023 13:51

HumbleDeer HumbleDeer

Level 4

Helpful post? (0)

Post #6
20372786 07 Jan 2023 13:51

ean 8712879149514
art no 3006033
unknown number 970806 (no designation on box)
#7 20399701 22 Jan 2023 19:34

bmarchais bmarchais

Level 5

Helpful post? (0)

Post #7
20399701 22 Jan 2023 19:34

Hey !

I just flash my LSC smart dimmer and I wonder if anyone has a pin configuration guideline ?

Thanks !
ADVERTISEMENT
#8 20596772 27 May 2023 22:14

cece94 cece94

Level 1

Helpful post? (0)

Post #8
20596772 27 May 2023 22:14

Good night everyone,

my lsc smart dimmer is flashed too with OpenBK7231T 1.17.130 firmware.

now i search for the configuration. i only found that if i put P11 (TXD1) => Btn whith channel 1 an 2
AND channel 1 mode = toggle / channel 2 mode = dimmer

sometime, there is some reaction on press or turn the button...

Someone have more information to configure this smart dimmer ?

thank you for reading and sorry for my bad english ^^
#9 20596880 27 May 2023 23:40

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Helpful post? (+1)

Post #9
20596880 27 May 2023 23:40

This device seems to have some kind of custom protocol. I would need your support to know what kind of packets is sent.

Can someone do UART capture on this device before flashing OBK or just flash OBK, set "startDriver TuyaMCU" into the startup command, reboot (of course), and then start playing with knob and see what kind of TuyaMCU packets are received in the Web App->Logs tab?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#10 20611754 10 Jun 2023 12:51

quirionais34 quirionais34

Level 1

Helpful post? (0)

Post #10
20611754 10 Jun 2023 12:51

Hi, I captured the logs of the rotary coder :

And the button :

That’s what you wanted ?
I await your feedback.
#11 20744849 24 Sep 2023 01:03

kopacztorfu2137 kopacztorfu2137

Level 2

Helpful post? (0)

Post #11
20744849 24 Sep 2023 01:03

Anyone managed to make this device not batch up packets? Its response time is terrible sometimes.
#12 20744899 24 Sep 2023 07:41

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Helpful post? (0)

Post #12
20744899 24 Sep 2023 07:41

Are you referring to Tuya firmware or OBK?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#13 20744976 24 Sep 2023 09:27

kopacztorfu2137 kopacztorfu2137

Level 2

Helpful post? (+1)

Post #13
20744976 24 Sep 2023 09:27

Both, I'm tired of this dimmer needing 101010 clicks to respond, and dimming lights through entire spectrum at once and will accept any solution.
Create an account, log in and become active in a forum and ads will not appear. You will receive points by participating in discussions.
Join this discussion.

Install the application

Topic summary

The discussion revolves around the teardown of the LSC Smart Dimmer Switch, which features a WB3S WiFi module, a Tuya MCU, and various components including LEDs and a rotary switch. Users are collaborating to understand the device's functionality, particularly in relation to its integration with OpenBekenIOT. Key points include the connection of the RGB LED and power/reset button to the TuyaMCU, while the green LED is linked to the charging circuit. Participants are sharing insights on pin configurations, UART packet captures, and issues with response times when using the device. There is a call for further information on the device's custom protocol and suggestions for improving its performance.
Summary generated by the language model.